Fix nats-general links (#4590)

 - [ ] Link to issue, e.g. `Resolves #NNN`
 - [ ] Documentation added (if applicable)
 - [ ] Tests added
- [ ] Branch rebased on top of current main (`git pull --rebase origin
main`)
- [ ] Changes squashed to a single commit (described
[here](http://gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html))
 - [ ] Build is green in Travis CI
- [ ] You have certified that the contribution is your original work and
that you license the work to the project under the [Apache 2
license](https://github.com/nats-io/nats-server/blob/main/LICENSE)

Resolves #

### Changes proposed in this pull request:

 - Fixes links to the `nats-general` repository.

GOVERNANCE.md

@@ -1,3 +1,3 @@
 # NATS Server Governance
 
-NATS Server is part of the NATS project and is subject to the [NATS Governance](https://github.com/nats-io/nats-general/blob/master/GOVERNANCE.md).
+NATS Server is part of the NATS project and is subject to the [NATS Governance](https://github.com/nats-io/nats-general/blob/main/GOVERNANCE.md).

MAINTAINERS.md

@@ -1,6 +1,6 @@
 # Maintainers
 
-Maintainership is on a per project basis. Reference [NATS Governance Model](https://github.com/nats-io/general/GOVERNANCE.md).
+Maintainership is on a per project basis. Reference [NATS Governance Model](https://github.com/nats-io/nats-general/blob/main/GOVERNANCE.md).
 
 ### Maintainers
   - Derek Collison <derek@nats.io> [@derekcollison](https://github.com/derekcollison)

README.md

@@ -53,7 +53,7 @@ The NATS product roadmap can be found [here](https://nats.io/about/#roadmap).
 
 ### Security Audit
 
-A third party security audit was performed by Cure53, you can see the full report [here](https://github.com/nats-io/nats-general/blob/master/reports/Cure53_NATS_Audit.pdf).
+A third party security audit was performed by Cure53, you can see the full report [here](https://github.com/nats-io/nats-general/blob/main/reports/Cure53_NATS_Audit.pdf).
 
 ### Reporting Security Vulnerabilities